package jdk8.lambda.lambda1;

import org.junit.Test;

import java.util.Comparator;

/**
 * @author Aunean
 * @date 2022/1/12 19:42
 */
/*
Lambda表达式的使用举例

 */
public class LambdaTest {

    @Test
    public void test1() {

        Runnable r1 = new Runnable() {

            @Override
            public void run() {
                System.out.println("我爱Java");
            }
        };
        r1.run();

        System.out.println("**********************");

        Runnable r2 = () -> System.out.println("我爱Python");
        r2.run();
    }

    @Test
    public void test2() {
        Comparator<Integer> com1 = new Comparator<Integer>() {
            @Override
            public int compare(Integer o1, Integer o2) {
                return Integer.compare(o1, o2);
            }
        };
        int compare = com1.compare(12, 23);
        System.out.println(compare);

        System.out.println("******************");

        //Lambda表达式写法
        Comparator<Integer> com2 = (o1, o2) -> Integer.compare(o1, o2);
        int compare1 = com2.compare(22, 23);
        System.out.println(compare1);

        System.out.println("******************");

        //方法引用写法
        Comparator<Integer> com3 = Integer::compare;
        int compare2 = com3.compare(22, 23);
        System.out.println(compare2);
    }
}
